Prop Spinning in neutral while sailing Engines and Such Forums

from the old old forums

prop slowly spins

From: sperkins@portup.com
Date: 03 Jan 2000

when sailing above 6k my prop turns very slowly how do I stop it from turning ?? I have put it in reverse with sucess but does that do any harm to the transmission?? I still have the original faryman and trans. In forward gear it tends to drain diesel into the oil and cause air in the lines and is very hard starting..any help would be welcome.

Scott

Re: prop slowly spins

From: Greg Smith
Date: 07 Jan 2000

You’ve got a problem that I’ve not encountered. I’m curious about your prop/engine combination. Is it possible that your Farymann is getting low on compression? As far as using reverse to stop the rotation, I don’t see how it would hurt the Hurth tranny. They are pretty rugged units. Mine actually went to New Zealand and back from Seattle free-wheeling, running a prop driven alternator and seems none the worse for wear. If you need some real expert opinion though, try Foley Industrial Engines (800)233-6539 or http://www.foleyengines.com/ They are a Hurth distributor and repair outfit and seem to be eager to talk to folks. Good luck…………….

Propellor noise DE38

From: Bob Bingham (Dulcinea)
Date: 31 Jan 2000

We also have a lot of prop. noise,from 1400 rpm>.We have a Volvo 42hp, currently we have the shaft out to replace the cutlass bearing which may be part of the problem.The problem may also be that the prop is at the forward end of the aperture and pressure waves from the tip of the prop blade may be thumping the hull because there is not enough clearance between the tip of the prop.and the bottom of the hull.This should be a minimum of 10% of the prop. diameter.We intend to move the prop.back 1-11/2″ as this will give more clearance at the tip.We have only just found the site which is why we are replying to message posted in Sept 99!!